大采高工作面采动围岩活动与瓦斯涌出关系
Relationship Between Surrounding Rock Movement and Gas Emission in Large Mining Height Working Face
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摘要: 为了研究大采高工作面采动围岩活动与瓦斯涌出的规律,现场实测斜沟煤矿18205工作面的液压支架支护阻力、超前支承压力及瓦斯涌出量,分析回采时支架支护阻力、超前支承压力的变化情况,根据现场实测工作面瓦斯涌出量,确定采动活动与瓦斯涌出的关系。结果证明:18205工作面矿压显现增大时,瓦斯涌出量显著升高;在周期来压时煤岩体卸压增流,工作面瓦斯涌出量明显升高。在周期来压期间覆岩裂隙通道受到挤压和冲击作用,高浓度的瓦斯流涌向工作空间,导致高位钻孔瓦斯抽采量明显增加,其与来压步距基本一致,且高位钻孔能有效拦截采空区及邻近层瓦斯,有效保障了工作面安全回采。Abstract: In order to study the laws of surrounding rock movement and gas emission in mining face with large mining height, the hydraulic support resistance, advanced support pressure and gas emission of 18205 working face in Xingou Coal Mine were measured on site, and the support resistance of support, advanced abutment pressure changes were analyzed, and the relation between mining activity and gas emission is determined according to the measured gas emission amount in the working face. The results show that the gas emission increases obviously when the strata pressure of 18205 working face increases, and when the pressure comes to a certain extent, the pressure and displacement of the coal and rock mass increase and the gas emission from the working face increases obviously. The crushed rock channel was squeezed and impacted during the period of pressure cycle. High concentration of gas flow flushed into the work space, resulting in a significant increase in gas drainage. The gas drainage was basically consistent with the pressure step, and the high level borehole can effectively block the gob and adjacent layers of gas to effectively protect the face safe mining.
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